An unprecedented tetranuclear Zn(II) complex with an unsymmetric Salen-type bisoxime ligand: synthesis, crystal structure, and spectral properties

摘要

A tetranuclear Zn(II) complex, [Zn_4L_2(OAc)_2(CH_3OH)_2] with an unsymmetric Salen-type bisoxime (H_3L = 6-hydroxy-4',6'-dibromo-2,2'-[ethylenediyIdioxybis(nitrilomethyIidyne)]diphenol), has been synthesized and structurally characterized. There are two kinds of coordination geometry (trigonal bipyramida! and square pyramidal) in the Zn(II) complex. The molecule has serious distortion probably from the asymmetry. The complex exhibits blue emission with the maximum emission wavelength λ_(max) = 423nm when excited with 340 nm.